STENNIS SPACE CENTER, Miss. - StenniSphere, the visitor center at NASA's John C. Stennis Space Center, will be closed June 3 for an on-site event. The center will reopen June 4 and resume normal operating hours. StenniSphere is open to the public 10 a.m. to 3 p.m., Wednesday through Saturday, and is closed on major holidays. (Source: NASA, 05/27/10)